2 Replies

Sorry, you can't use regexes for a replacement functionality or string modifications that way.The only thing that works is concatenating multiple matches/references separated by spaces:

e.g.: 1,2,3 => ([0-9]+),([0-9]+),([0-9]+) => 1 2 3

As described in the hint text:

Optionally enter a transformation regular expression to extract relevant information. The resulting value will be the tagged expression or, if more expressions are present, the combination of all tagged expressions separated with a blank. Sample: Regex "ID=(.*)" and input "ID=66" will result in a value of "66". Regex "ID=([^_]*)_[^_]*_(.*)" and input "ID=66_867_07" will result in a value of "66 07".